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NullPointerException

NullPointerException

2007-01-08       - By cbowditch
Reply:     1     2     3     4     5     6  


Hi Kevin,

thanks for the prompt reply. I have found an alternative solution to my
problem. Namely:

<xsl:template name="notused">
<xsl:apply-templates select="//region[@(protected)='coveringletter']"/>
<xsl:apply-templates select="//region[@(protected)='statement']"/>
</xsl:template>

The XML trees being matched by these statements is massive and full of all
sorts not just text. I wanted to find a way of having these xsl elements in
the stylesheet but to avoid them having an affect on the output! The above
solution seems to work a lot better than the xsl:comment approach.

Thanks again,

Chris


Kevin Cormier-2 wrote:
>
> Hi Chris,
>
> In your message, you said "Now I realise that it might seem like a strange
> thing to do, but I really need to be able to place xsl elements inside an
> xsl:comment."  I'm not quite sure what you mean by that.  You are allowed
> to use xsl:apply-templates within a comment, but the invoked templates
> must
> produce text nodes only.  It would be an error to use xsl:element inside a
> comment, though Xalan would ignore it and just not output the element.
>
> See the XSLT 1.0 spec, section 7.4:  "It is an error if instantiating the
> content of xsl:comment creates nodes other than text nodes. An XSLT
> processor may signal the error; if it does not signal the error, it must
> recover by ignoring the offending nodes together with their content."
> (http://www.w3.org/TR/xslt#section-Creating-Comments)
>
> In any case, there should not be a NullPointerException.  Please open a
> bug
> on JIRA, and try again to whittle down the stylesheet to a small example
> that you can share with us.  I created a small stylesheet using the
> snippet
> you gave, but I didn't see any NPE with it.
>
>
> Kevin Cormier
> Software Developer, XSLT Development
> E-mail:  kcormier@(protected)
>
>
>
>                                                                            
>              cbowditch                                                    
>              <bowditch_chris@(protected)                                            
>              otmail.com>                                                To
>                                        xalan-j-users@(protected)        
>              01/08/2007 10:17                                           cc
>              AM                                                            
>                                                                    Subject
>                                        NullPointerException                
>                                                                            
>                                                                            
>                                                                            
>                                                                            
>                                                                            
>                                                                            
>
>
>
>
>
> Hi,
>
> I have a xsl:xstylesheet that crashes in both 2.6.0 and 2.7.0 with a NPE.
> Heres the stack trace:
>
> javax.xml.transform.TransformerException: java.lang.NullPointerException
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2341)
>         at
> org.apache.xalan.templates.ElemTemplate.execute(ElemTemplate.java:393
> )
>         at
> org.apache.xalan.templates.ElemCallTemplate.execute(ElemCallTemplate.
> java:247)
>         at
> org.apache.xalan.templates.ElemForEach.transformSelectedNodes(ElemFor
> Each.java:420)
>         at
> org.apache.xalan.templates.ElemForEach.execute(ElemForEach.java:259)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemElement.constructNode(ElemElement.java
> :338)
>         at
> org.apache.xalan.templates.ElemElement.execute(ElemElement.java:287)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemTemplate.execute(ElemTemplate.java:393
> )
>         at
> org.apache.xalan.templates.ElemCallTemplate.execute(ElemCallTemplate.
> java:247)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemChoose.execute(ElemChoose.java:140)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at org.apache.xalan.templates.ElemIf.execute(ElemIf.java:161)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.transformer.TransformerImpl.transformToString(Transf
> ormerImpl.java:2019)
>         at
> org.apache.xalan.templates.ElemComment.execute(ElemComment.java:85)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(Tran
> sformerImpl.java:2202)
>         at
> org.apache.xalan.transformer.TransformerImpl.transformNode(Transforme
> rImpl.java:1276)
>         at
> org.apache.xalan.transformer.TransformerImpl.transform(TransformerImp
> l.java:673)
>         at
> org.apache.xalan.transformer.TransformerImpl.transform(TransformerImp
> l.java:1192)
>         at
> org.apache.xalan.transformer.TransformerImpl.transform(TransformerImp
> l.java:1170)
>         at org.apache.xalan.xslt.Process.main(Process.java:987)
> Caused by: java.lang.NullPointerException
>         at
> org.apache.xml.serializer.SerializerBase.getPrefix(SerializerBase.jav
> a:841)
>         at
> org.apache.xalan.templates.ElemAttribute.resolvePrefix(ElemAttribute.
> java:130)
>         at
> org.apache.xalan.templates.ElemElement.execute(ElemElement.java:240)
>         at
> org.apache.xalan.templates.ElemAttribute.execute(ElemAttribute.java:1
> 07)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         ... 60 more
> ---------
> java.lang.NullPointerException
>         at
> org.apache.xml.serializer.SerializerBase.getPrefix(SerializerBase.jav
> a:841)
>         at
> org.apache.xalan.templates.ElemAttribute.resolvePrefix(ElemAttribute.
> java:130)
>         at
> org.apache.xalan.templates.ElemElement.execute(ElemElement.java:240)
>         at
> org.apache.xalan.templates.ElemAttribute.execute(ElemAttribute.java:1
> 07)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemTemplate.execute(ElemTemplate.java:393
> )
>         at
> org.apache.xalan.templates.ElemCallTemplate.execute(ElemCallTemplate.
> java:247)
>         at
> org.apache.xalan.templates.ElemForEach.transformSelectedNodes(ElemFor
> Each.java:420)
>         at
> org.apache.xalan.templates.ElemForEach.execute(ElemForEach.java:259)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemElement.constructNode(ElemElement.java
> :338)
>         at
> org.apache.xalan.templates.ElemElement.execute(ElemElement.java:287)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemTemplate.execute(ElemTemplate.java:393
> )
>         at
> org.apache.xalan.templates.ElemCallTemplate.execute(ElemCallTemplate.
> java:247)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemChoose.execute(ElemChoose.java:140)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at org.apache.xalan.templates.ElemIf.execute(ElemIf.java:161)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(
> ElemApplyTemplates.java:395)
>         at
> org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTempla
> tes.java:177)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.transformer.TransformerImpl.transformToString(Transf
> ormerImpl.java:2019)
>         at
> org.apache.xalan.templates.ElemComment.execute(ElemComment.java:85)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResul
> t.java:682)
>         at
> org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(Tr
> ansformerImpl.java:2336)
>         at
> org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(Tran
> sformerImpl.java:2202)
>         at
> org.apache.xalan.transformer.TransformerImpl.transformNode(Transforme
> rImpl.java:1276)
>         at
> org.apache.xalan.transformer.TransformerImpl.transform(TransformerImp
> l.java:673)
>         at
> org.apache.xalan.transformer.TransformerImpl.transform(TransformerImp
> l.java:1192)
>         at
> org.apache.xalan.transformer.TransformerImpl.transform(TransformerImp
> l.java:1170)
>         at org.apache.xalan.xslt.Process.main(Process.java:987)
>
> I did a search in JIRA but couldn't see anything similar. It appears to be
> related to the following in my stylesheet:
>
> <xsl:comment>
> <xsl:apply-templates select="//region[@(protected)='coveringletter']"/>
> <xsl:apply-templates select="//region[@(protected)='statement']"/>
> </xsl:comment>
>
> If I comment this out then the transform doesn't throw a NPE. My XML and
> stylesheet are quite big and also confidential so I can't post it here. I
> did try creating a cut down version but the NPE didnt occur. Now I realise
> that it might seem like a strange thing to do, but I really need to be
> able
> to place xsl elements inside an xsl:comment. Can anyone offer any further
> insight?
>
> Thanks,
>
> Chris
> --
> View this message in context:
> http://www.nabble.com/NullPointerException-tf2939928.html#a8219739
> Sent from the Xalan - J - Users mailing list archive at Nabble.com.
>
>
>
>
>

--
View this message in context: http://www.nabble.com/NullPointerException
-tf2939928.html#a8221633
Sent from the Xalan - J - Users mailing list archive at Nabble.com.